O7-4 Temporal trends in sport participation according to WHO physical activity guidelines and its effect on weight status: a French school-based study between 2015 and 2019

Abstract Background Insufficient physical activity (PA) is an important risk factor for overweight and obesity among adolescents, both causes of cardiovascular diseases. Sport is the largest contributor to achieving the World Health Organization (WHO) PA levels guidelines. However, few studies have investigated temporal trends in weekly sport participation in relation to adolescents' weight status. The main objective of this study was to compare sport participation to weight status and investigate their relationship over time. Methods Two data collections were conducted during spring 2015 (n = 1019) and 2019 (n = 1112) in 30 French high schools. Adolescents reported their age, sex, height, weight, parents' socioeconomic status (SES) and hours of sport per week. Body mass index was calculated and classified into three categories (normal weight, overweight, obese) according to the International Obesity Task Force. Three sports groups were created according to WHO PA guidelines: no sport (NS), sport less than 7 hours a week (7-) and sport more than or equal to 7 hours a week (7+). Binary logistic regressions adjusted for age, sex and SES were performed to evaluate sport participation, weight status and their relationship over time. Results Between 2015 and 2019, prevalence of overweight and obesity increased from 9.1% to 14.1%, with this increase greater among low-SES girls. We observed an increase in both the proportion of adolescents playing 7+ hours of sport (8.0% to 12.3%) and those not playing sport (34.2% to 35.9%). These changes varied according to adolescents' SES. In 2019, low-SES adolescents were 1.5 times less likely to play sport (95% CI:1.17-1.99) while no change was observed among high-SES adolescents. Finally, 7+ adolescents were no more likely to be overweight or obese in 2019 compared to 2015. Contrarily, NS and 7- adolescents were 1.7 and 1.8 times more likely respectively to be overweight or obese in 2019 compared to 2015. Conclusion These results confirm the adequacy of WHO PA recommendations to counter the rise of overweight and obesity, and show that enough hours of sport participation alone could help stabilize overweight and obesity prevalence, without controlling for other forms of PA.


Background
Insufficient physical activity (PA) is an important risk factor for overweight and obesity among adolescents, both causes of cardiovascular diseases. Sport is the largest contributor to achieving the World Health Organization (WHO) PA levels guidelines. However, few studies have investigated temporal trends in weekly sport participation in relation to adolescents' weight status. The main objective of this study was to compare sport participation to weight status and investigate their relationship over time. Methods Two data collections were conducted during spring 2015 (n = 1019) and 2019 (n = 1112) in 30 French high schools. Adolescents reported their age, sex, height, weight, parents' socioeconomic status (SES) and hours of sport per week. Body mass index was calculated and classified into three categories (normal weight, overweight, obese) according to the International Obesity Task Force. Three sports groups were created according to WHO PA guidelines: no sport (NS), sport less than 7 hours a week (7-) and sport more than or equal to 7 hours a week (7+). Binary logistic regressions adjusted for age, sex and SES were performed to evaluate sport participation, weight status and their relationship over time.

Results
Between 2015 and 2019, prevalence of overweight and obesity increased from 9.1% to 14.1%, with this increase greater among low-SES girls. We observed an increase in both the proportion of adolescents playing 7+ hours of sport (8.0% to 12.3%) and those not playing sport (34.2% to 35.9%). These changes varied according to adolescents' SES. In 2019, low-SES adolescents were 1.5 times less likely to play sport (95% CI:1.17-1.99) while no change was observed among high-SES adolescents. Finally, 7+ adolescents were no more likely to be overweight or obese in 2019 compared to 2015. Contrarily, NS and 7-adolescents were 1.7 and 1.8 times more likely respectively to be overweight or obese in 2019 compared to 2015.

Conclusion
These results confirm the adequacy of WHO PA recommendations to counter the rise of overweight and obesity, and show that enough hours of sport participation alone could help stabilize overweight and obesity prevalence, without controlling for other forms of PA. Keywords: weight status; obesity; sport; physical activity; social inequalities Abstract citation ID: ckac094.053 O7-5 School-based interventions to reduce accelerometer based children's sedentary time: presentation of a systematic review Caroline Bernal 1 , Lena Lhuisset 1 , Nicolas Fabre 1 , Julien Bois 1 1 STAPS, Université de Pau et des Pays de l'Adour (UPPA), Tarbes, France Corresponding author: bernalcaroline@gmail.com

Background
Sedentary time (ST) is considered as a major public health concern. Children are particularly vulnerable as their ST increase with age. Therefore, school-based interventions aimed to reduce and prevent children ST are burgeoning. Previously a review found that school-based interventions proposing multiples components which include standing desks appeared to be more effective compared to uni-component studies (Hegarty et al., 2016). However, this result only depended on 11 records published before 2016 and must be verified since the growing number of school-based interventions are proposed. Objective: To continue the evaluation of the effectiveness of school-based interventions published since the previous review (2016). Methods A total of 4 databases were examined: PubMed-Medline, PsycINFO, ScienceDirect and Google Scholar. The search was conducted using keywords in English, the main ones being: 1) ''Sedentary Time'' 2) ''Intervention'' 3) ''Child'', 4) ''School''. Records published between August 2016 and August 2019 with objective measure of ST were analysed. Data were collected and compiled by an author according to PRISMA criteria. Results 14 studies were included: 9 studies were multi-components (64%) and 5 were uni-component (36%). The method of measurement used in all studies was accelerometry. Environmental and organizational changes were the most used components. Among fourteen, nine studies reported significant results on post-intervention: respectively, with three being uni-component and six being multi-components. The long-term effect remain undetermined.

Conclusion
Uni component studies used only environmental reorganization which reduces ST in the short term. This finding had already been supported in previous interventions studies using standing desks that had been identified by the last systematic review (Aminian et al., 2015;Clemes et al., 2016). The uni-and multi-components studies do not differ clearly in the results obtained. However, multi-components interventions seem to be the more promising strategy to reduce ST and to develop Abstract citation ID: ckac094.054 O7-6 Global Matrix 3.0 Physical Activity Report Card for Children and Youth: A comparison across Europe

Background
The Global Matrix of report card grades on physical activity serves as a public health awareness tool by summarising the status of child and youth physical activity prevalence and action. Since schools and the wider community and environment are critical influences on the physical activity levels of children and youth, this research sought to examine the factors considered when assigning these grades across included European countries. Specifically, we sought to: (1) provide a detailed examination of the evidence informing these indicators across participating European Global Matrix 3.0 countries; (2) explore the comparability of the grades for these two indicators across Europe; (3) detail any limitations or issues with the methods used to assign grades; and (4) provide suggestions on how future grading of the indicators could be improved.

Methods
Key documents relating to the European countries involved in the 2018 Global Matrix 3.0 were collated. This inlcuded the long and short forms of the report card for each country as well as the scientific paper. A template was developed and used to capture information on: the grade assigned for each indicator; details of the data used to assign the grade, the source of the data; indication of the quality of the data and any reported challenges or issues in assigning the grade for both the 'School' and 'Community and Environment' indicators.